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    <div>div的内容 div的内容 div的内容 div的内容 div的内容 </div>
    <button>改变div的背景颜色</button>

    <p>p段落..12312321</p>

    <ul>
        <li>张三</li>
        <li>李四</li>
        <li>王五</li>
        <li>赵六</li>
        <li>孙七</li>
    </ul>

    <h2>标题2222</h2>

    <p>今天又是新的一天,开开心心写代码,一包烟,一行代码写一天 ,一个bug改一天</p>
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